BENDIX SD-08-2414 Turbo CUT-OFF Feature Refer to Figure, Bendix AD-IPAIR Dryer Sectional View

DESICCANT
BED
OIL				SPRING
SEPARATOR
		DESICCANT
		CARTRIDGE
PURGE
ORIFICE
		PURGE		PIPE PLUG
CONTROL		VOLUME
PORT
SUPPLY		CHECK
		VALVE
PORT
		(BLACK)
TURBO				DELIVERY
CUT-OFF				PORT
VALVE			CARTRIDGE	O-RING
PURGE
			BOLT	CHECK VALVE
VALVE		DELIVERY
	CARTRIDGE			(WHITE)
		PORT
	BOLT
Old Style End Cover -Vertical Delivery Check Valve			New Style End Cover - Horizontal Delivery Check Valve

FIGURE 4 - BENDIX® AD-IP®AIR DRYER SECTIONAL VIEW

The actual reactivation of the desiccant drying bed begins as dry air flows from the purge volume through the purge orifice in the desiccant cartridge bolt, then through the center of the bolt and into the desiccant bed. Pressurized air from the purge volume expands after passing through the purge orifice; its pressure is lowered and its volume increased. The flow of dry air through the drying bed

CONTROL

PORT

SUPPLY

PORT

TURBO

CUT-OFF

VALVE

PURGE

VALVE

FIGURE 5 - AD-IP®INTEGRAL PURGE AIR DRYER TURBO

CUT-OFF

6

reactivates the desiccant material by removing the water vapor adhering to it. Generally 30 seconds are required for the entire purge volume of a standard Bendix® AD-IP®air dryer to flow through the desiccant drying bed.

The delivery check valve assembly prevents air pressure in the brake system from returning to the air dryer during the purge cycle. After the 30 second purge cycle is complete the desiccant has been reactivated or dried. The air dryer is ready for the next charge cycle to begin. However the purge valve will remain open and will not close until air brake system pressure is reduced and the governor signals the compressor to charge the system.

TURBO CUT-OFF FEATURE (Refer to Figure 5)

The primary function of the turbo cut-off valve is to prevent loss of engine turbocharger air pressure through the AD-IP air dryer in systems where the compressor intake is connected to the engine turbocharger. The turbo cut-off valve also removes the “puffing” of air out the open purge exhaust when a naturally aspirated, single cylinder compressor, equipped with an inlet check valve, is in use.